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WindowServer: Add a "scale" parameter to the SetResolution message and plumb it through

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Now, `chres 640 480 2` can set the UI to HighDPI 640x480 at runtime. A
real GUI for changing the display factor will come later.

(`chres 640 480 2` followed by `chres 1280 960` is very fast since
we don't have to re-allocate the framebuffer since both modes use
the exact same number of physical pixels.)
This commit is contained in:
Nico Weber 2021-01-15 14:53:53 -05:00 • committed by Andreas Kling
parent 248d75e13b
commit 63ac9462ad
9 changed files with 53 additions and 32 deletions
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44
Userland/Services/WindowServer/Screen.cpp
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@ -69,43 +69,53 @@ Screen::~Screen()
close(m_framebuffer_fd);
}
bool Screen::set_resolution(int width, int height, int scale_factor)
bool Screen::set_resolution(int width, int height, int new_scale_factor)
{
FBResolution physical_resolution { 0, (unsigned)(width * scale_factor), (unsigned)(height * scale_factor) };
int new_physical_width = width * new_scale_factor;
int new_physical_height = height * new_scale_factor;
if (physical_width() == new_physical_width && physical_height() == new_physical_height) {
assert(scale_factor() != new_scale_factor);
on_change_resolution(m_pitch, physical_width(), physical_height(), new_scale_factor);
return true;
}
FBResolution physical_resolution { 0, (unsigned)new_physical_width, (unsigned)new_physical_height };
int rc = fb_set_resolution(m_framebuffer_fd, &physical_resolution);
#ifdef WSSCREEN_DEBUG
dbg() << "fb_set_resolution() - return code " << rc;
#endif
if (rc == 0) {
on_change_resolution(physical_resolution.pitch, physical_resolution.width, physical_resolution.height, scale_factor);
on_change_resolution(physical_resolution.pitch, physical_resolution.width, physical_resolution.height, new_scale_factor);
return true;
}
if (rc == -1) {
dbg() << "Invalid resolution " << width << "x" << height;
on_change_resolution(physical_resolution.pitch, physical_resolution.width, physical_resolution.height, scale_factor);
on_change_resolution(physical_resolution.pitch, physical_resolution.width, physical_resolution.height, new_scale_factor);
return false;
}
ASSERT_NOT_REACHED();
}
void Screen::on_change_resolution(int pitch, int physical_width, int physical_height, int scale_factor)
void Screen::on_change_resolution(int pitch, int new_physical_width, int new_physical_height, int new_scale_factor)
{
if (m_framebuffer) {
size_t previous_size_in_bytes = m_size_in_bytes;
int rc = munmap(m_framebuffer, previous_size_in_bytes);
if (physical_width() != new_physical_width || physical_height() != new_physical_height) {
if (m_framebuffer) {
size_t previous_size_in_bytes = m_size_in_bytes;
int rc = munmap(m_framebuffer, previous_size_in_bytes);
ASSERT(rc == 0);
}
int rc = fb_get_size_in_bytes(m_framebuffer_fd, &m_size_in_bytes);
ASSERT(rc == 0);
m_framebuffer = (Gfx::RGBA32*)mmap(nullptr, m_size_in_bytes, PROT_READ | PROT_WRITE, MAP_SHARED, m_framebuffer_fd, 0);
ASSERT(m_framebuffer && m_framebuffer != (void*)-1);
}
int rc = fb_get_size_in_bytes(m_framebuffer_fd, &m_size_in_bytes);
ASSERT(rc == 0);
m_framebuffer = (Gfx::RGBA32*)mmap(nullptr, m_size_in_bytes, PROT_READ | PROT_WRITE, MAP_SHARED, m_framebuffer_fd, 0);
ASSERT(m_framebuffer && m_framebuffer != (void*)-1);
m_pitch = pitch;
m_width = physical_width / scale_factor;
m_height = physical_height / scale_factor;
m_scale_factor = scale_factor;
m_width = new_physical_width / new_scale_factor;
m_height = new_physical_height / new_scale_factor;
m_scale_factor = new_scale_factor;
m_physical_cursor_location.constrain(physical_rect());
}